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// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2019 Mantas Pucka <mantas@8devices.com>
// Copyright (c) 2019 Robert Marko <robert.marko@sartura.hr>
//
// Driver for IPQ4019 SD/MMC controller's I/O LDO voltage regulator
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
static const unsigned int ipq4019_vmmc_voltages[] = {
1500000, 1800000, 2500000, 3000000,
};
static const struct regulator_ops ipq4019_regulator_voltage_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
static const struct regulator_desc vmmc_regulator = {
.name = "vmmcq",
.ops = &ipq4019_regulator_voltage_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.volt_table = ipq4019_vmmc_voltages,
.n_voltages = ARRAY_SIZE(ipq4019_vmmc_voltages),
.vsel_reg = 0,
.vsel_mask = 0x3,
};
static const struct regmap_config ipq4019_vmmcq_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
};
static int ipq4019_regulator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct regulator_init_data *init_data;
struct regulator_config cfg = {};
struct regulator_dev *rdev;
struct regmap *rmap;
void __iomem *base;
init_data = of_get_regulator_init_data(dev, dev->of_node,
&vmmc_regulator);
if (!init_data)
return -EINVAL;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
rmap = devm_regmap_init_mmio(dev, base, &ipq4019_vmmcq_regmap_config);
if (IS_ERR(rmap))
return PTR_ERR(rmap);
cfg.dev = dev;
cfg.init_data = init_data;
cfg.of_node = dev->of_node;
cfg.regmap = rmap;
rdev = devm_regulator_register(dev, &vmmc_regulator, &cfg);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register regulator: %ld\n",
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
platform_set_drvdata(pdev, rdev);
return 0;
}
static const struct of_device_id regulator_ipq4019_of_match[] = {
{ .compatible = "qcom,vqmmc-ipq4019-regulator", },
{},
};
MODULE_DEVICE_TABLE(of, regulator_ipq4019_of_match);
static struct platform_driver ipq4019_regulator_driver = {
.probe = ipq4019_regulator_probe,
.driver = {
.name = "vqmmc-ipq4019-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(regulator_ipq4019_of_match),
},
};
module_platform_driver(ipq4019_regulator_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mantas Pucka <mantas@8devices.com>");
MODULE_DESCRIPTION("IPQ4019 VQMMC voltage regulator");
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